Middlesbrough manager Tony Mowbray has revealed the injury to top scorer Lukas Jutkiewicz is not as serious as was first feared.
The striker damaged his lateral knee ligament in training and there was a possibility he would require surgery.
But a scan has revealed he does not need to go under the knife and Mowbray is hopeful he may return to action during the middle of next month.
"He's had a scan and he's seen a specialist and it doesn't seem that he needs an operation," Mowbray told the Evening Gazette.
"He's damaged his lateral knee ligament and he could be out for about four weeks.
"It was a training ground collision, nothing out of the ordinary but unfortunately Lukas suffered some damage. Hopefully it just needs time to heal."
Jutkiewicz has been a key player for Tony Mowbray's side this campaign, scoring four goals in six matches.
The 23-year-old missed the start of the season after undergoing an operation during the summer on his other knee.